AaronFiore/electrum
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android: don't keep adding BarcodeScannerView instances to contentFrame when starting camera

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When putting app to background with qr scanner active, then moved to foreground again,
SimpleScannerActivity instance is not destroyed, but the local mScannerView was re-initialized
with a new instance (through startCamera()) regardless of pre-existing instance, and added to
the contentFrame. This leaves the previous mScannerView instance in limbo, potentially getting
garbage collected at unpredictable times.
This commit is contained in:
Sander van Grieken
2025-07-22 09:42:15 +02:00
parent 8eb3c43603
commit 3947733d9f
1 changed files with 13 additions and 11 deletions
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2
electrum/gui/qml/java_classes/org/electrum/qr/SimpleScannerActivity.java
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@@ -88,6 +88,7 @@ public class SimpleScannerActivity extends Activity {
} }
private void startCamera() { private void startCamera() {
if (mScannerView == null) {
mScannerView = new BarcodeScannerView(this); mScannerView = new BarcodeScannerView(this);
mScannerView.setCropRatio(0.75f); // Set crop ratio to 75% (this defines the square area shown in the scanner view) mScannerView.setCropRatio(0.75f); // Set crop ratio to 75% (this defines the square area shown in the scanner view)
// by default only Format.QR_CODE is set // by default only Format.QR_CODE is set
@@ -99,6 +100,7 @@ public class SimpleScannerActivity extends Activity {
// Return false to stop scanning after first result // Return false to stop scanning after first result
return false; return false;
}); });
}
mScannerView.openAsync(); // Start camera on resume mScannerView.openAsync(); // Start camera on resume
} }